chem lab 132 experiment 2

chem lab 132 experiment 2 - David Shin Chemistry 132 Lab...

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David Shin Chemistry 132 Lab Report Lab Partner: Minsung Kim 2/10/10 Experiment 2: Free Energy in Chemical Reactions Introduction The purpose of this lab was to determine the   ΔH° of neutralization for two weak acids(acetic acid and chloroacetic acid) as well as to determine the equilibrium Ka constants concerning the dissociation of the two weak acids. ΔG° values will be provided with these measurements. Concerning the lab procedure, the lab manual (pages 9-12) was used. Also, in order to be more efficient, two thermometers were used in the experiment rather than one. Data and Observation Thermometer # Cold water °C (50mL) Hot water °C (50mL) 209* 11.6 39.0 218 11.6 39.0 *Thermometer 209 was calibrated to 0.1°C lower than that of thermometer 218. In order to be consistent and to account for the differences in temperatures for both thermometers, 0.1°C will be added to each temperature of thermometer 209. Part 1: Determination of the Calorimeter Constant The hot and cold water temperatures were recorded for 4 minutes. After, they were mixed together in a Dewer flask. The temperature of the mixture was recorded for 4 minutes.
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Time(seconds ) thermometer Cold water (°C) Hot water (°C) 0 12.2 32.6 20 12.2 32.6 40 12.2 32.8 60 12.2 33.0 80 12.2 32.9 100 12.2 32.9 120 12.3 32.8 140 12.3 32.7 160 12.3 32.7 180 12.4 32.6 200 12.4 32.5 220 12.4 32.5 240 12.4 32.4 Time(seconds) Mixture of Hot and Cold water (°C) 0 22.9 20 22.9 40 22.8 60 22.9 80 22.9
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100 22.9 120 23.0 140 23.0 160 23.0 180 23.0 200 23.0 220 23.1 240 23.1 [Series1= Cold water, Series2= Hot water, Series3= Mixed water] Part 2: Determination of the Enthalpy change, ΔH° Acetic acid(1M), sodium hydroxide(1.02M), and chloroacetic acid(1M) were utilized in this part of the experiment. NaOH: 21.3°C Acetic acid: 21.3°C Mixing of both acid and base: 27.3°C after 5 seconds Time (seconds) Temperature of the mixture (°C) 20 27.9 40 27.9 60 27.9 80 27.8 100 27.7 120 27.7 140 27.7 160 27.6 180 27.6
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200 27.6 220 27.6 240 27.5 Second time: NaOH: 21.4°C Acetic Acid: 21.3°C Mixing acid and base: 27.4°C after 8 seconds Time (seconds) Temperature of mixture of Acid and Base (°C) 20 28.1 40 28.1 60 28.1 80 28.0 100 28.0 120 27.9 140 27.9 160 27.9 180 27.8 200 27.8 220 27.7 240 27.7
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Chloroacetic acid: 21.4°C NaOH: 21.2°C Mixture of acid and base: 26.8°C after 10 seconds Time (seconds) Temperature of mixture of acid and base (°C)
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chem lab 132 experiment 2 - David Shin Chemistry 132 Lab...

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